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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

HR Diagram
x Carinae
w Carinae
Polis
YZ Ceti
V2306 Ophiuchi
La Superba
Struve 2398 A
DO Cephei
Kruger 60 A
Koit
Koeia
s Velorum A
ο1 Cygni
Struve 2398 B
Nashira
θ Hydrae
Sharjah
Pincoya
Poerava
Mekbuda
π Cephei
Miram
Alkaphrah
β Reticuli
Cerberus
b Velorum
AX Microscopii
41 Draconis
Adhafera
a Velorum
Acubens
Guniibuu
GX Andromedae
HD 37131
Nosaxa
Felixvarela
FL Virginis
Gakyid
ι1 Scorpii
Kapteyn's Star
HR 5546
ε Indi
Dombay
e Aquilae
Ebla
Erakis
Copernicus
Wolf 359
δ Pavonis
Wezen
W Virginis
ρ Cygni
Wolf 498
Zaniah
HR 7687
14 Persei
Polaris
π5 Orionis
Castor B
Capella
Lalande 18115
Proxima Centauri
Canopus
BZ Crucis
15 Orionis
Rastaban
19 Cygni
BF Orionis
Betelgeuse
δ Andromedae
δ Caeli
Ran
β Pictoris
δ Circini
β Doradus
Azmidi
Deneb
η Carinae
Enif
Antares
Sham
γ Pavonis
Alchiba
θ Circini
ε Reticuli
Alfirk
Teegarden's Star
σ Orionis
Naos
Arneb
Sirius
Sirius B
χ Cygni
α Telescopii
τ Ceti
Almaaz
Tarazed
Alnilam
Alnitak
ν2 Canis Majoris
Suhail
Schedar
WX Ursae Majoris
van Maanen's Star
Atria
Rigel
α Centauri A
Mebsuta
61 Cygni A
61 Cygni B
Ross 154
HO Librae
UV Ceti
Menkar
Avior
Unurgunite
Hatysa
Achird
U Sagittarii
ο Capricorni B
Sadr
Aspidiske
Tureis
Mira
Saiph
Mirfak
EE Leonis
Sargas
Gliese 536
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

Indexes

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